About David_

David_ · 2024-09-18

How to set GPIO output speed register (slow, medium, fast, very fast) in accordance to SPI and the slower I2C, clock speeds respectively? The data sheet specify in rise/fall time. Is it correct that the register actually set drive current?SPI clock...

David_ · 2024-09-09

Please help pointing to learning material on this.We can unserstnd that below library was written in proper engineering style so that it can be (a) ported to various STM chips. (b) can select use of POLL, Interrupt and DMA mode by "linking/select" th...

David_ · 2024-08-17

We created an empty C++ project. Then, added some web-sourced .cpp and .hpp code into the directory. Compiled and debugged with ST-Link MiniE fine. Entry is main.cppIn STM32CubeIDE, click .ioc and edit init code with STM32MX. STM32MX generates mai...

David_ · 2024-08-17

Had tried for some time but still did not get it. The MCU and sensor are both mainstream, typical and relatively simple.Any pointer to a complete (with STM32 project and MX .ioc) example code for STM32 MCU SPI interfacing with a sensor chip. Many t...

David_ · 2024-08-16

Transmitter at 1x dBm. Receiver at threshold of decoding or error. About -110 to -120 dBm as reported by the software RSSI value. Need attenator of 140 dB.Many thanks

David_ · 2024-09-19

Data sheet says, "The GPIOs can sink or source up to ±8 mA, and sink or source up to ± 20 mA (with arelaxed VOL/VOH).". There is no time value in this spec. May be it refers to continuous current rating before the pad heat up and burn. On switchin...

David_ · 2024-09-19

Interesting to see slow speed 50kHz is getting critical. Just double checked data sheet, they specified many timing parameters. Rise and fall times have maximum and no value for minimum.

David_ · 2024-09-18

Many thanks. May I ask what pull up R, I2C clock speed in that case? What are signal wiring lengths? Was it a custom made PCB or bread board?

David_ · 2024-09-18

AN4899 states SPI signal pin has schmitt trigger. Presumably, a slower rise/fall signal will be read ok, without generating a lot of high and low when signal is passing slowly at threshold level. Right?

David_ · 2024-09-11

Many thanks for reply. We shall be reading the doc.1. Can we run the two board demo you mentioned, we have one NucleoF401RE and several Nucleo F103RB?2. In MX, ST SPI CPOL and CPHA (1_EDGE, 2_EDGE), how it corresponds to different terminology used...

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GPIO output speed register setting

Need education material pointer to library code for driving external-to-stm32 chips

Main.c and main.cpp when mixing C and C++

Any complete example code for MCU SPI interfacing with a sensor chip

Any idea for a bench top attenuator for LoRa link budget?

Re: GPIO output speed register setting

Re: GPIO output speed register setting

Re: GPIO output speed register setting

Re: GPIO output speed register setting

Re: Need education material pointer to library code for driving external-to-stm32 chips